Energoprojekt ENTEL

Belgrade, Serbia

Energoprojekt ENTEL

Belgrade, Serbia
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Zivotic M.M.,Energoprojekt Entel | Jovanovic V.V.,University of Belgrade | Manic N.G.,University of Belgrade | Stojiljkovic D.D.,University of Belgrade
FME Transactions | Year: 2017

Recently, research in the field of coal combustion include impurities, specifically halogen elements (F, Cl, Br, I and At). Emission of chlorides and fluorides from the combustion depends on content and forms of these elements in coal, combustion process and emission reduction equipment. Examination of chlorides and fluorides content in coal and in flue gas is particularly important for design of flue gas desulphurisation plant, the integral part of the modern power plants which ensure meeting the requirements of SO2 emission regulations. In flue gas desulphurisation facilities, the presence of HCl may increase sorbent consumption and HCl and HF have the influence on wastewater treatment. This paper presents the results of chlorine and fluorine contents in domestic lignites and their concentration in flue gas. The aim of investigation was to determine the reference Cl and F concentrations in flue gas that would be used in the design of flue gas desulphurization plant. © 2017, Faculty of Mechanical Engineering, Belgrade.

Pantovic V.S.,University of Belgrade | Petrovic-BecIrovic S.B.,Energoprojekt Entel
Thermal Science | Year: 2016

Buildings consume a significant amount of energy today and are expected to consume even more in the future. This consumption necessitates the use of fossil fuels such as coal and natural gas, both of which have significant environmental impacts. While renewable energy sources remain promising, the most of the energy supply will still use conventional fuels in the near term. Therefore, improving the energy efficiency in buildings is critical, and one of the central visions of "smart buildings" is to reduce their energy use while maintaining the same level of service and comfort. However, to make the buildings meaningfully "smart", their envelopes must first be made compliant with the current energy efficiency standards. In this paper, we first examine how the public awareness of energy efficiency was risen in Serbia through different demonstration projects, funded by the state budget and through implementation of the energy efficiency measures in public buildings, funded by municipal funds and soft loans from the banks. Then, we describe how the energy efficiency in buildings might further be increased by the use of new technologies and smart networks for control of the energy consumption. We finally, argue that these controls should take into account the personal variables (activity, clothing) along with environmental variables (air temperature, velocity, and humidity) for an optimum thermal comfort to be achieved in public and residential buildings.

Zivotic M.M.,Energoprojekt ENTEL | Stojiljkovic D.D.,University of Belgrade | Jovovic A.M.,University of Belgrade | Cudic V.V.,Institute of Public Health
Hemijska Industrija | Year: 2012

In Serbia, the ash from power plants has long been labelled as hazardous waste. With the adoption of the appropriate legislation this ash became waste with the potential usage. In this paper an analysis of the fly ash and bottom ash composition, which are disposed of in the power plant "Nikola Tesla A" landfill, is presented. Thirty samples, divided into three sets, were analyzed for trace elements As, Ba, Be, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Ti, V and Zn. The first and second set of samples were taken at the depth of 0.0-0.6 m, from cassette III, at the place of waste discharge (set I) and in the centre of the cassette (set II).The third set of samples was taken from the same cassette spot but at the different depth. The estimated variations in quality within individual sets, as well as the comparison between sets I and II, were performed. The repeatability of results by the depth of cassette (set III) was also analyzed. The mixture consisting of 79.4% limestone, 17% clay, 0.5% sand, 0.55% iron ore, 0.55% of steel mill waste and 2% ash from the thermal power plant "Nikola Tesla A" was adopted as the reputable mixture for cement making. For concrete making, the same cement mixture was used but with 2.1% of the same ash material added. The results showed possibility of further fly and bottom ash use as the cement and concrete material.

Petrovic Becirovic S.B.,Energoprojekt ENTEL | Manic N.G.,University of Belgrade | Stojiljkovic D.D.,University of Belgrade
Thermal Science | Year: 2015

Pellet stoves may play an important role in Serbia in the future when fossil fuel fired conventional heating appliances are replaced by more efficient and environmentally friendly devices. Experimental investigation was conducted in order to examine the influence of wood pellet quality, as well as burner capacity (6, 8, and 10 kW), used in the same stove configuration, on the performance of pellet stove with declared nameplate capacity of 8 kW. The results obtained showed that in case of nominal load and combustion of pellets recommended by the stove manufacturer, stove efficiency of 80.03% was achieved. The use of lower quality pellet caused additional 1.13 kW reduction in heat output in case of nominal load and 0.63 kW in case of reduced load. This was attributed to less favourable properties and lower bulk and particle density of lower quality pellet. The use of different burner capacity has shown to have little effect on heat output and efficiency of the stove when pre-set values in the control system of the stove were not altered. It is concluded that replacement of the burner only is not sufficient to increase/decrease the declared capacity of the same stove configuration, meaning that additional measures are necessary. These measures include a new set-up of the stove control system, which needs to be properly adjusted for each alteration in stove configuration. Without the adjustment mentioned, declared capacity of the stove cannot be altered, while its CO emission shall be considerably increased.

Mandic-Lukic J.S.,Energoprojekt Entel | Pantovic V.S.,Center for Information Systems Supervision | Vasiljevic Z.S.,Energoprojekt Entel
Thermal Science | Year: 2012

Limited energy resources and environmental concerns due to ever increasing energy consumption, more and more emphasis is being put on energy savings. Smart networks are promoted worldwide as a powerful tool used to improve the energy efficiency through consumption management, as well as to enable the distributed power generation, primarily based on renewable energy sources, to be optimally explored. To make it possible for the smart networks to function, a large number of electronic devices is needed to operate or to be in their stand-by mode. The consumption of these devices is added to the consumption of many other electronic devices already in use in households and offices, thus giving rise to the overall power consumption and threatening to counteract the primary function of smart networks. This paper addresses the consumption of particular electronic devices, with an emphasis placed on their thermal losses when in stand-by mode and their total share in the overall power consumption in certain countries. The thermal losses of electronic devices in their stand-by mode are usually neglected, but it seems theoretically possible that a massive increase in their number can impact net performance of the future smart networks considerably so that above an optimum level of energy savings achieved by their penetration, total consumption begins to increase. Based on the current stand-by energy losses from the existing electronic devices, we propose that the future penetration of smart networks be optimized taking also into account losses from their own electronic devices, required to operate in stand-by mode.

Tomasovic N.,Energoprojekt Entel
Thermal Science | Year: 2015

The aim of this paper is to analyse the expansion of the thermal generation in the long-term for the Western Balkan region. This paper concentrates on the estimation of long-term energy data for the (Western) Balkan countries. The process was implemented by the use of the PRIMES model in order to perform simulations for the future growth of electricity supply and demand in the region. Two scenarios were applied. The first (Baseline) scenario was based on the current energy path of each country and on the absence of any specific energy policy like tax emissions or renewable subsidies. The second (Reference) scenario was practically a series of "environmental" sub-scenarios, based on specific energy subsidy policy applied to the electricity generated by renewable sources. Results were given for the period between 2015 and 2050 in 5-year steps and conclusions were made for the whole region. As such, the results can feed up trials of energy planning referring to the future energy condition.

Becirovic S.P.,Energoprojekt ENTEL | Vasic M.,Energoprojekt ENTEL
Energy and Buildings | Year: 2013

Efficient use of energy has become an imperative in the modern world, mainly for the reasons associated with environmental pollution, sustainable development, security of energy supply and global geo-political stability. Having in mind that the building sector is responsible for 40% of the European Union's total energy consumption, every improvement made in order to improve building energy performance is deemed largely beneficial. Serbia has invested in extensive national energy-efficiency program with an aim to enable refurbishment of 62 public buildings, namely schools, health care and social care institutions. Approach used in order to identify the cost optimal improvement of each building was developed in line with EU recommendations and was proven trustful in terms of results and final project outcome. Measurement conducted in order to verify energy savings achieved confirmed that annual gross final energy consumption was reduced by 47%, thereby enabling related carbon footprint to be reduced by 5.038 tCO2/a in total. Project-specific financial indicators have shown that energy savings achieved resulted in acceptable payback period for the investments made, equalling approximately 13 years in average. This is considered acceptable having in mind poor initial condition of the facilities refurbished and low price of locally available and commonly used coal. © 2013 Elsevier B.V. All rights reserved.

Mandic-Lukic J.,Energoprojekt Entel | Simic N.,Elektrotehnicki Fakultet U Beogradu | Stojanovic B.,Energoprojekt Entel | Milinkovic B.,Energoprojekt Entel
2011 19th Telecommunications Forum, TELFOR 2011 - Proceedings of Papers | Year: 2011

The following document presents results of study and experimental research of electrical installations as Smart Home systems transmission medium. In the previous research it is especially demonstrated the influence of installations nods, i.e. distribution boards. Results presented herewith aim to ensure better understanding and solving this problem. The procedure of approximately determination of nodes impedance is presented. The analysis and the optimal impedance values specification of communication equipment for the electrical installation purpose are presented. © 2011 IEEE.

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